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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab36e69ff69a78a18762a40496b93717104c7e9a84a2e896eed595fc5276beeb' 
  AND token = 'oeXqmg7HupCjkqY7pgy3QrpyisdYCX00MckHI3UbcKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}